If the period of a simple pendulum is t and you increase its length so that it is 4 times longer, what will the new period be?

a) t/4
b) t/2
c) 2t
d) 4t
e) it is unchanged.

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.